Heater for air-engines



(No Model.)

J. A. WOODBURY, J. MERRILL, G. PATTEN B. F. WOODBURY. l 4 EEATEE EOE AIE ENGINES. N0.'289,485. "'j Patented Dec. 4, 1883.

u A u UNITED STATES ATENT OFFICE.

JAMES A. WOODBURY, JOSHUA MERRILL, GEORGEPATTEN, AND EDWARD E. wooDBUEY, or BOSTON, MASSACHUSETTS.

HEATER FOR AIR-ENGINES.

SPECIFICATION forming part of LettersPatentNd 289,485, dated December 4, 1883.

` Application filed May 16, 1883. (No model.)

To coll whom t may concern:

Be it known that we` JAMES A. WOODBUEY, JOSHUA MERRILL, GEORGE 'PATTEN, and EE- WAED F. WOQDEUEY, all of Boston, in the county of Suffolk Aand State of Massachusetts, have invented jointly a new and useful Improvement in Heaters for Air Engines, of which the following, taken in connection with the accompanying drawings, is a specification.

Our invention relates to the construction of heaters for airfengines;` and it consists of a heater composed of apan or cup shaped casting having a circular wall, the greater portion of which is vertical, and a closed head at one end and an outwardly-projecting flange at its other end, and a series of bent tubes having arms of unequal length, the short arms of which are inserted in holes through the bottom or head, and the long arms in `holes through the liange of said casting, and firmly secured therein in such a manner that the air in passing from the chamber above the displacenpiston through the regenerator tothe chamber below said piston must` pass through said tubes and be subjected to an intense heat from the hot gases and products of c0mbustion surrounding said tubes.

Figure 1 of the drawings is a` central verti-` cal section of the regenerator-cylinder, the displacer-cylinder and piston, the cooler, `and.

` heater of an airengine embodying ourinvention; and Fig. 2 is ahalf-inverted plan of our improved heater detached. p l

In the draWings,`A is the regenerator-cylinder, B is the cooler-cylinder, B" is.`the displacer-cylinder,` C the cooler-cover, and D D the displacer-piston,`all constructed,arranged, and operating substantially as `.described `in another application offevendate herewith, eX- cept that the displacer-cylinder B does not enter the heater. y l

E is the heater-casting, made in the form of a flat-bottomed cup or pan, and havin'gan outwardly-projecting iiange, c, surrounding its upper end, by means of which and suitable bolts (not shown)` it is iirmlysecuredto the lower end of the regenerator-cylinder A. A series of tubes,\b b, each bent, as shown, to a form somewhat resembling the letter J, with itslong andshort arms parallel with each other, are "inserted the short arm in holes through the bottom of the casting E and the long arms in holes through the iiange a, and

Vfirmly securedtherein, as shown in Fig. 1.

andsmall columns surrounded by llame and hot gases.

The tubes b b may be firmly secured in the heater casting E by brazng, by expanding them, or by casting the metal around them, said tubes being set in proper positions in the flask, in connection With the pattern, and remaining in the sand after the pattern is removed.

What we claim as new, and desire to secure by Letters Patent of the United States, is-

A heater composed of the cup-shaped casting E, provided at its open end with theiiange a, and a series of bent tubes, b b, having their short arms inserted in and secured tothe bottom of said casting and their long arms inserted in and secured to the flange a, substantially as and for` the purposes described.

`In testimony whereof we have signed our names to this specification, in the presence of two subscribing witnesses, on this 14th day of May, A. D. 1883.

Witnesses:

E. A. HEMMENWAY, WALTER- E. LOMBARD. 

